I bought my 1529 new, and the bucket always folded (drifted) forward, as well as the loader drifting down(but not as severe as the bucket), even at High RPM's,medium RPM's...etc. This was my first tractor and im used to running heavy equipment so I sort of thought it was normal and due to its smaller pistons and H.P. I mentioned it to the Dealer when scheduling an APPT to have the tractor checked out before the warranty expired, and he said it should not do that. Upon inspection they found that 2 or more of the pistons had manufacturing flaws, causing the issue. Unfortunately the loader itself was out of warranty but they made good on the parts and I just had to pay for labor.......no problems since.......If you search "bucket Drift" on this site you might find my old thread on it where others had some input before I knew what it was......good luck and keep us informed!!
